in radeon_texstate.c
radeon_validate_texgen()
keithw made a note while implementing tcl.

...
   else if (texUnit->TexGenEnabled & Q_BIT) {
   /* Very easy to do this, in fact would remove a fallback case
    * elsewhere, but I haven't done it yet... Fallback:
    */
   fprintf(stderr, "fallback Q_BIT\n");
   return GL_FALSE;
   }
...

keith: any hints what needs to be done?
which add. fallback could get removed?